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Posted: 4/21/2009 9:51:51 PM EDT
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I went with a friend of mine over to his grandfathers house who passed away a year or two ago and found this.
His grandfather was a gunsmith and reloader who loaded for a few police depts. in our area and also made a few custom guns. He had tons of brass and bullets laying everywhere, including some calibers I've never even heard of when I came across what looks like a shortened .50 BMG. The case is a LC 66 that looks like it's been shortened about an inch then re-necked to .50 Whats also weird is when you look down inside, the primer looks like it extends up from the bottom of the case about 3/4" Any ideas what it is? I've looked eveywhere I can think of and can't find anything like it. 
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For those that never had the pleasure...
The spotter rifle was mouned atop the 106mm Recoilless rifle as in osprey21's picture. There was a knob on the left side of the mount for elevation and firing. Pull Out and the spotter rifle fired. It was designed to match the trajectory of 106mm rounds (HEAT & HEP-T) and besides the tracer element there was a white phosphorus element in the nose that gave of an unmistakable white puff on inpact.If impact missed, adjust and fire another spotter. If impact on target - Push In!!! The rifle was normally jeep mounted and as I recall, carried 6 rounds. The backblast left no doubt where you were, so hopefully the driver had the motor running! large Recoilles weapons like the 106mm were Shoot & Scoot weapons. You did not want to miss or try to fight it out with a tank platoon. There were normally 2 gun jeeps assigned to an Infantry Company as the Anti Tank section. The heat and consussion from firing is something you never forget... There was also a short lived 105mm version which had the .50 Cal Spotter Rifle as well as 2 smaller shoulder fired versions in 57mm & 90mm. And one portable 75mm version. More Info: Here |
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Quoted:
I saw one of those spotter's somewhere fore sale once... wonder if its feasable to make some sort of a rifle out of it? It weighs 23 lbs Don’t know where to get the reloading specs/brass/dies etc.??? it is about 1750 fps to match the 1650 fps of the 106. |
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Quoted: For those that never had the pleasure... The spotter rifle was mouned atop the 106mm Recoilless rifle as in osprey21's picture. There was a knob on the left side of the mount for elevation and firing. Pull Out and the spotter rifle fired. It was designed to match the trajectory of 106mm rounds (HEAT & HEP-T) and besides the tracer element there was a white phosphorus element in the nose that gave of an unmistakable white puff on inpact.If impact missed, adjust and fire another spotter. If impact on target - Push In!!! The rifle was normally jeep mounted and as I recall, carried 6 rounds. The backblast left no doubt where you were, so hopefully the driver had the motor running! large Recoilles weapons like the 106mm were Shoot & Scoot weapons. You did not want to miss or try to fight it out with a tank platoon. There were normally 2 gun jeeps assigned to an Infantry Company as the Anti Tank section. The heat and consussion from firing is something you never forget... There was also a short lived 105mm version which had the .50 Cal Spotter Rifle as well as 2 smaller shoulder fired versions in 57mm & 90mm. And one portable 75mm version. More Info: Here The Marine M50 'ONTOS' carried six 106mm recoilless rifles and two (and sometimes four) M8C spotter rifles.  |
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There are supposedly some 57mm and 75mm civilian owned guns that are part of the NFA registry as "destructive devices." A company could start making them again if they wanted to. A girl named "Destiny" was posting about re-watting (or repairing) her 57mm rifle to firing condition over on the Impact Guns D.D. forum until it was taken down. She somehow obtained a new chamber off the Chinese copy of our 57mm, and was exploring ways to reload the rounds.
Most of the 57mm recoiless guns were shoulder-fired, but unlike a bazooka, they had a precision rifled barrel and a precision optical scope. The 57mm had its origins in the old Brittish "Six Pound" field artillery piece - which also had the 57mm bore and fire a projectile that also weighed six pounds. But a recoiless rifle lets you launch 6 pound projectiles off the shoulder, while a traditional Brit "6 pounder" had to be towed by a jeep and crew served. Quoted:
For those that never had the pleasure... The spotter rifle was mouned atop the 106mm Recoilless rifle as in osprey21's picture. There was a knob on the left side of the mount for elevation and firing. Pull Out and the spotter rifle fired. It was designed to match the trajectory of 106mm rounds (HEAT & HEP-T) and besides the tracer element there was a white phosphorus element in the nose that gave of an unmistakable white puff on inpact.If impact missed, adjust and fire another spotter. If impact on target - Push In!!! The rifle was normally jeep mounted and as I recall, carried 6 rounds. The backblast left no doubt where you were, so hopefully the driver had the motor running! large Recoilles weapons like the 106mm were Shoot & Scoot weapons. You did not want to miss or try to fight it out with a tank platoon. There were normally 2 gun jeeps assigned to an Infantry Company as the Anti Tank section. The heat and consussion from firing is something you never forget... There was also a short lived 105mm version which had the .50 Cal Spotter Rifle as well as 2 smaller shoulder fired versions in 57mm & 90mm. And one portable 75mm version. More Info: Here |
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Quoted:
Quoted:
Mystery solved, thanks guys.  i dont know about that. the top view looks as if that round was cut down by hand and not yet chamfered. i would research wildcats like the 50 alaskan. No, the tube coming from the primer pretty much seals the deal. .50 Alaskan is nothing like this cartridge. 
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